<template>
  <div>
    <!-- <div>面包屑导航区 -->
    <Breadcrumb :List = "list"></Breadcrumb>
    <!-- 卡片视图区 -->
    <el-card>
      <!-- 提示区 -->
      <el-row :gutter="20">
        <el-col :span="22">
          <el-alert
            title="添加商品信息"
            type="info"
            center
            show-icon
            :closable = "false">
          </el-alert>
        </el-col>
        <el-col :span="2">
          <el-button type="info" @click = "handle">取消</el-button>
        </el-col>
      </el-row>
      <!-- 步骤条区域 -->
      <el-steps :space="300" :active="activeKey-0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <!-- tab栏区 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-position = "top" label-width="100px">
        <el-tabs :tab-position="'left'" :before-leave = "beforeTabLeave" style="height: 100%;" v-model="activeKey" @tab-click = "TabClicked">
          <el-tab-pane label="基本信息" name = "0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader
                v-model="addForm.goods_cat"
                :options="CateList"
                expandTrigger = 'hover'
                :props="cateProps"
                @change="handleChange">
              </el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name = "1">
            <!-- 渲染表单的item项目 -->
            <el-form-item v-for = "item in manyTableData" :key = "item.attr_id" :label = "item.attr_name">
              <!-- 复选框 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox v-for = "(cb,i) in item.attr_vals" :key = "i" :label="cb" border></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name = "2">
            <el-form-item :label = "item.attr_name" v-for = "item in onlyTableData" :key = "item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name = "3">
            <el-upload
              :action="uploadUrl"
              :headers="headerObj"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :on-success = "handleSuccess">
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name = "4">
            <!-- 富文本编辑器组件 -->
            <quill-editor
              v-model="addForm.goods_introduce"
            />
            <!-- 添加商品按钮 -->
            <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
    <!-- 图片预览 -->
    <el-dialog
      title="图片预览"
      :visible.sync="PreviewVisible"
      width="50%">
      <img :src="previewPath" class = "previewImg">
    </el-dialog>
  </div>
</template>
<script>
import Breadcrumb from '../Breadcrumb.vue'
import _ from 'lodash'
export default {
  components: { Breadcrumb },
  data () {
    return {
      list: ['商品管理', '添加商品'],
      activeKey: 0,
      // 动态参数列表
      manyTableData: [],
      // 静态属性列表
      onlyTableData: [],
      // 商品分类列表
      CateList: [],
      // 上传图片地址
      uploadUrl: 'http://vueshop.pixiv.download/api/private/v1/upload',
      previewPath: 'http://vueshop.pixiv.download/api/private/v1/',
      // 控制图片预览框显示
      PreviewVisible: false,
      // 添加商品表单对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_number: 0,
        goods_weight: 0,
        // 商品所属分类数组
        goods_cat: [],
        // 图片数组
        pics: [],
        // 商品的详情描述
        goods_introduce: '',
        attrs: []
      },
      // 添加表单验证规则
      addFormRules: {
        goods_name: [{
          required: true,
          message: '请输入商品名称',
          trigger: 'blur'
        }],
        goods_price: [{
          required: true,
          message: '请输入商品价格',
          trigger: 'blur'
        }],
        goods_number: [{
          required: true,
          message: '请输入商品数量',
          trigger: 'blur'
        }],
        goods_weight: [{
          required: true,
          message: '请输入商品重量',
          trigger: 'blur'
        }],
        goods_cat: [{
          required: true,
          message: '请选择商品分类',
          trigger: 'blur'
        }]
      },
      cateProps: {
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      // 图片上传组件请求头
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      }

    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    // 获取商品分类列表
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类数据失败!')
      }
      this.CateList = res.data
    },
    // 获取动态参数列表和静态属性列表
    async TabClicked () {
      if (this.activeKey === '1') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
          params: {
            sel: 'many'
          }
        })
        if (res.meta.status !== 200) {
          return this.$message.error('获取动态参数列表失败！')
        }
        res.data.forEach(item => {
          if (item.attr_vals.length === 0) {
            item.attr_vals = []
          } else {
            item.attr_vals = item.attr_vals.split(' ')
          }
        })
        this.manyTableData = res.data
      } else if (this.activeKey === '2') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
          params: {
            sel: 'only'
          }
        })
        if (res.meta.status !== 200) {
          return this.$message.error('获取静态属性列表失败！')
        }
        this.onlyTableData = res.data
      }
    },
    // 发起请求添加商品
    async add () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) {
          return this.$message.error('请填写必要的表单项!')
        }
        // 添加
        // 深拷贝操作
        const form = _.cloneDeep(this.addForm)
        // 数组转字符串,以逗号分割
        form.goods_cat = form.goods_cat.join(',')
        // 处理动态参数和静态属性
        this.manyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(' ')
          }
          this.addForm.attrs.push(newInfo)
        })
        this.onlyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals
          }
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs
        const { data: res } = await this.$http.post('goods', form)
        if (res.meta.status !== 201) {
          return this.$message.error('添加商品失败!')
        }
        this.$message.success('添加商品成功!')
        this.$router.push('/goods')
      })
    },
    // 级联选择器选中项变化触发
    handleChange () {
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },
    beforeTabLeave (acitveName, oldActiveName) {
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请先选择商品分类!')
        return false
      }
    },
    // 处理图片预览效果
    handlePreview (file) {
      this.previewPath += file.response.data.tmp_path
      this.PreviewVisible = true
    },
    // 处理移除图片
    handleRemove (file) {
      // 获取图片临时路径
      const filePath = file.response.data.tmp_path
      // 找到索引值
      const i = this.addForm.pics.findIndex(x => {
        return x.pics === filePath
      })
      // 调用splice方法移除
      this.addForm.pics.splice(i, 1)
    },
    // 监听图片上传成功
    handleSuccess (response) {
      // 拼接得到一个图片信息对象
      const picInfo = {
        pic: response.data.tmp_path
      }
      // 将图片对象加入到图片数组
      this.addForm.pics.push(picInfo)
    },
    // 取消添加回到商品列表
    handle () {
      this.$router.push('/goods')
    }
  },
  computed: {
    // 获取三级分类ID
    cateId () {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>

<style>
.el-checkbox{
  margin: 0 10px 0 0;
}
.previewImg{
  width: 100%;
}
</style>
